I heard about this in F-Droid’s latest blog post.
It is based on the Bramble protocol and is compatible with Briar.
It removed mesh-networking features of Briar and added a couple new ones:
- voice messaging
- ML-KEM (post-quantum cryptography)
- disappearing messages
More technical details are shared on their blog.
Sources are on Github https://github.com/zerionproject/Zerion
How would this compare to SimpleX chat? On SimpleX, you could host your own sever too, and run over tor. Maybe this does everything like that for you since using tor already?
This one has native onion rotation and no need to host a server (it uses a simpler message queuing, might be less efficient when both parties are often offline). Also SimpleX is not designed to run over TOR if I remember correctly (more complexity).
You can connect to SimpleX over tor, and you can run SimpleX servers over a tor hidden services.